<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .content{
            width: 100px;
            height: 100px;
            background: red;
            border-radius: 50%;
            box-shadow: 0 0 0 10px blue,
                        0 0 0 20px green,
                        0 0 0 30px yellow;
            top: 50%;
            left: 50%;
            transform: translate(-50%,-50%);      
            position: absolute;
            animation-name: rotate;
            animation-duration: 2s;
            animation-iteration-count: infinite;
            animation-timing-function: ease-in-out;
            animation-delay: 0.5s;
        }


        @keyframes rotate {
            0%{
                transform: scale(1);
            }
            50% {
                transform: scale(1.2);
            }
            100%{
                transform: scale(1);
            }
        }
    </style>
</head>
<body>
    <div class="content"></div>
</body>
</html>